Optimization on aerodynamic performance of turbine transition section

Optimization on the turbine transition section(TTS) between the high pressure turbine(HPT) and the low pressure turbine(LPT) in a mid-power gas turbine was conducted by CFD method. Based on original TTS and load struct, the inlet guide vane(IGV) and the TTS were newly designed on the Design3D, an optimization platform belong to Numeca software. The results of numerical simulation show that the aerodynamic performance of the newly designed TTS can fully satisfy with the design indices. Because the flow field in the TTS must match with that of the HPT and the LPT, the components in TTS should be designed from a globe view point. The controlling of duct curvature and throughflow area can be used to ensure there is no separate in duct while keep the distribution of static pressure in radial direction uniformity, clearly in flow direction, loss of total-pressure lowest.